Smoke detector



FIG. 1 is a perspective view of a smoke detector showing our new design with a battery warning arm in the deployed position, with the bottom being flat and unornamented;

FIG. 2 is a top view of the smoke detector of FIG. 1;

FIG. 3 is a side view of the smoke detector of FIG. 1 ; and,

FIG. 4 is a top view of the smoke detector of FIG. 1 with the battery warning arm in the stored position. 

The ornamental design for a smoke detector, as shown and described. 